Andalusite is an aluminosilicate mineral belonging to the sillimanite family, commonly found in metamorphic rocks.
Andalusite presents three main properties
- Andalusite is a prismatic and anhydrous crystal
- Andalusite is a high purity mineral
- Andalusite transforms into mullite at low temperature, between 1200 and 1550°C for micronized grades.
Andalusite is available out of France (Kerphalite™) and South Africa (Durandal™, Purusite™, Randalusite™).
In refractory applications, using andalusite has many benefits:
- Volume stability
- Very good creep resistance and refractoriness under load
- High thermal shock resistance
- Good chemical attack and slag and metal penetration resistances
Andalusite run of mine – used for standard refractory applications especially shaped refractory.
Andalusite premium grades – especially designed for high quality refractories such as glass or kiln furniture.
Andalusite sieved milled grades – ideal to reinforce the refractory matrix from RCC to ULCC.
Kerphalite KF is a natural source of alumina and mullite which can be profitably used when better control of your ceramic support’s physical and chemical properties of is required.
Due to its high-purity and very fine particle size distribution, micronized Kerphalite KF is an efficient and economical alternative to zircon silicate as an opacifier for glazes and engobes.
For more details and individual datasheets, please contact us.